[continued from previous message]   
      
      -I revised my script called "install" and some scripts and one function   
   that it calls.  These all belong to my SAM menu called Zombie--which I hope to   
   release soon as a library.  Script install uses rsync to clone a reference   
   Slackware installation    
   and then tweaks it to make changes needed for good behavior when installed to   
   a flashdrive, plus some other helpful tweaks as well.   
      
      -Using my revised Zombie menu I installed ZombieSlack/Slackware-15.0 to a   
   GPT partition on a flashdrive, making it EFI-bootable in the process.  It took   
   two tries to get the code right, but in the end it worked.  I'm using it now   
   to post this.  I just    
   plugged the flashdrive into my old Prodesk tower and booted the UEFI entry.    
   Note that this is real Slackware, *with* persistence.   
      
   To answer your question about what you can do:   
      
      -I would guess that you can just run grub-install again until you get it   
   right, without re-installing Slackware.  That's what I did, anyway.   
      
      -Note that I did *not* use chroot.  Here is the grub-install invocation   
   that I used in my script.   
      
               grub-install --recheck \   
               --boot-directory /mnt/to/boot \   
               --removable \   
               --target x86_64-efi \   
               --efi-directory /mnt/EFI_install \   
               --bootloader-id grub \   
               $1   
      
   I gave "/dev/sdd" for "$1", as that's what the flashdrive happened to be when   
   I ran the script.  The flashdrive had a gpt partition table and four   
   partitions (I used parted):   
      
      #   f.s.   mounted            GB   flags   
      1   ext2   /mnt/to            23   
      2   ext2   /mnt/keep_install  0.5   
      3   swap                      1.0   
      4   fat32  /mnt/EFI_install   0.2  boot, esp   
      
   Let me say that this was just a "first success", so maybe there's a better way   
   to do it.   
      
   Good luck to you!   
      
   -Joe   
      
   P.S.  I used the "tips" you provided, prior experience, plus this website:   
      
   https://linuxlink.timesys.com/docs/engineering/wiki/HOWTO_Instal   
   _GRUB2_with_EFI_support   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)